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/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */
#include "common.h"
#include "llist.h"
#include "istream.h"
#include "ostream.h"
#include "strescape.h"
#include "master-service.h"
#include "master-interface.h"
#include "connect-limit.h"
#include "penalty.h"
#include "anvil-connection.h"
#include <unistd.h>
#define MAX_INBUF_SIZE 1024
#define ANVIL_CLIENT_PROTOCOL_MAJOR_VERSION 1
#define ANVIL_CLIENT_PROTOCOL_MINOR_VERSION 0
struct anvil_connection {
struct anvil_connection *prev, *next;
int fd;
struct istream *input;
struct ostream *output;
struct io *io;
bool version_received:1;
bool handshaked:1;
bool master:1;
bool fifo:1;
};
static struct anvil_connection *anvil_connections = NULL;
static const char *const *
anvil_connection_next_line(struct anvil_connection *conn)
{
const char *line;
line = i_stream_next_line(conn->input);
return line == NULL ? NULL : t_strsplit_tabescaped(line);
}
static int
anvil_connection_request(struct anvil_connection *conn,
const char *const *args, const char **error_r)
{
const char *cmd = args[0];
unsigned int value, checksum;
time_t stamp;
pid_t pid;
args++;
if (strcmp(cmd, "CONNECT") == 0) {
if (args[0] == NULL || args[1] == NULL) {
*error_r = "CONNECT: Not enough parameters";
return -1;
}
if (str_to_pid(args[0], &pid) < 0) {
*error_r = "CONNECT: Invalid pid";
return -1;
}
connect_limit_connect(connect_limit, pid, args[1]);
} else if (strcmp(cmd, "DISCONNECT") == 0) {
if (args[0] == NULL || args[1] == NULL) {
*error_r = "DISCONNECT: Not enough parameters";
return -1;
}
if (str_to_pid(args[0], &pid) < 0) {
*error_r = "DISCONNECT: Invalid pid";
return -1;
}
connect_limit_disconnect(connect_limit, pid, args[1]);
} else if (strcmp(cmd, "CONNECT-DUMP") == 0) {
connect_limit_dump(connect_limit, conn->output);
} else if (strcmp(cmd, "KILL") == 0) {
if (args[0] == NULL) {
*error_r = "KILL: Not enough parameters";
return -1;
}
if (!conn->master) {
*error_r = "KILL sent by a non-master connection";
return -1;
}
if (str_to_pid(args[0], &pid) < 0) {
*error_r = "KILL: Invalid pid";
return -1;
}
connect_limit_disconnect_pid(connect_limit, pid);
} else if (strcmp(cmd, "LOOKUP") == 0) {
if (args[0] == NULL) {
*error_r = "LOOKUP: Not enough parameters";
return -1;
}
if (conn->output == NULL) {
*error_r = "LOOKUP on a FIFO, can't send reply";
return -1;
}
value = connect_limit_lookup(connect_limit, args[0]);
o_stream_nsend_str(conn->output,
t_strdup_printf("%u\n", value));
} else if (strcmp(cmd, "PENALTY-GET") == 0) {
if (args[0] == NULL) {
*error_r = "PENALTY-GET: Not enough parameters";
return -1;
}
value = penalty_get(penalty, args[0], &stamp);
o_stream_nsend_str(conn->output,
t_strdup_printf("%u %s\n", value, dec2str(stamp)));
} else if (strcmp(cmd, "PENALTY-INC") == 0) {
if (args[0] == NULL || args[1] == NULL || args[2] == NULL) {
*error_r = "PENALTY-INC: Not enough parameters";
return -1;
}
if (str_to_uint(args[1], &checksum) < 0 ||
str_to_uint(args[2], &value) < 0 ||
value > PENALTY_MAX_VALUE ||
(value == 0 && checksum != 0)) {
*error_r = "PENALTY-INC: Invalid parameters";
return -1;
}
penalty_inc(penalty, args[0], checksum, value);
} else if (strcmp(cmd, "PENALTY-SET-EXPIRE-SECS") == 0) {
if (args[0] == NULL || str_to_uint(args[0], &value) < 0) {
*error_r = "PENALTY-SET-EXPIRE-SECS: "
"Invalid parameters";
return -1;
}
penalty_set_expire_secs(penalty, value);
} else if (strcmp(cmd, "PENALTY-DUMP") == 0) {
penalty_dump(penalty, conn->output);
} else {
*error_r = t_strconcat("Unknown command: ", cmd, NULL);
return -1;
}
return 0;
}
static void anvil_connection_input(struct anvil_connection *conn)
{
const char *line, *const *args, *error;
switch (i_stream_read(conn->input)) {
case -2:
i_error("BUG: Anvil client connection sent too much data");
anvil_connection_destroy(conn);
return;
case -1:
anvil_connection_destroy(conn);
return;
}
if (!conn->version_received) {
if ((line = i_stream_next_line(conn->input)) == NULL)
return;
if (!version_string_verify(line, "anvil",
ANVIL_CLIENT_PROTOCOL_MAJOR_VERSION)) {
if (anvil_restarted && (conn->master || conn->fifo)) {
/* old pending data. ignore input until we get
the handshake. */
anvil_connection_input(conn);
return;
}
i_error("Anvil client not compatible with this server "
"(mixed old and new binaries?) %s", line);
anvil_connection_destroy(conn);
return;
}
conn->version_received = TRUE;
}
while ((args = anvil_connection_next_line(conn)) != NULL) {
if (args[0] != NULL) {
if (anvil_connection_request(conn, args, &error) < 0) {
i_error("Anvil client input error: %s", error);
anvil_connection_destroy(conn);
break;
}
}
}
}
struct anvil_connection *
anvil_connection_create(int fd, bool master, bool fifo)
{
struct anvil_connection *conn;
conn = i_new(struct anvil_connection, 1);
conn->fd = fd;
conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
if (!fifo) {
conn->output = o_stream_create_fd(fd, SIZE_MAX);
o_stream_set_no_error_handling(conn->output, TRUE);
}
conn->io = io_add(fd, IO_READ, anvil_connection_input, conn);
conn->master = master;
conn->fifo = fifo;
DLLIST_PREPEND(&anvil_connections, conn);
return conn;
}
void anvil_connection_destroy(struct anvil_connection *conn)
{
bool fifo = conn->fifo;
DLLIST_REMOVE(&anvil_connections, conn);
io_remove(&conn->io);
i_stream_destroy(&conn->input);
o_stream_destroy(&conn->output);
if (close(conn->fd) < 0)
i_error("close(anvil conn) failed: %m");
i_free(conn);
if (!fifo)
master_service_client_connection_destroyed(master_service);
}
void anvil_connections_destroy_all(void)
{
while (anvil_connections != NULL)
anvil_connection_destroy(anvil_connections);
}
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